Igneous rock that is the volcanic equivalent of granite, whose chemical composition is similar. Rhyolites are known from all parts of the Earth and from all geologic ages; they are found mostly on the continents or their immediate margins, but small quantities have been described from remote islands.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on rhyolite, visit Britannica.com.
Seen & Heard
What made you look up rhyolite? Please tell us what you were reading, watching or discussing that led you here.